Re: [WICG/webcomponents] Add delegatesLabel and a content attribute to specify the label element within a shadow tree (#916)

> I was under the impression this was specifically for the HTML `label` element so it could target a specific element within custom element's shadow tree.

I think full support here would require more than simply support for the HTML `label` element as the `label` element itself does not work with ARIA radios or ARIA checkboxes (as an example). 

I think additional support here is warranted for delegation of additional ARIA attributes. We have button web component which delegates focus to a native button so we can avoid reinventing the wheel while still getting all the benefits of custom elements, encapsulation, etc. While the label solves a big problem, it certainly doesn't solve every problem. Is there an issue tracking the delegation of additional attributes?

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